In a linear motor coil assembly (12), and a method for manufacturing the same, a plurality of coils (14) are arranged in a line in a direction of movement and have respective coil axes perpendicular to the direction of movement of the motor. A flat cooling tube (20) is arranged to meander inside the plurality of coils. The cooling tube has a cross section elongated in a direction parallel to the coil axes, and a plurality of clearance holes (25) through which coolant flows are formed inside the cooling tube. The cooling tube has interleaved folds at least equal in number to the number of coils. The coils being fitted into these folds. At the time of manufacture of the coil assembly, the coils are wound around cores that are divided for each coil, and the cores are inserted into the folds of the cooling tube.
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1. A linear motor coil assembly for developing linear motion, comprising:
a plurality of coils arranged in a line in a direction of movement each coil having an associated coil axis, said coil axes being perpendicular to the direction of motion; and a flat cooling tube, said cooling tube having a cross section elongated in a direction parallel to the coil axes and folds into which said coils are adapted to engage, said cooling tube meandering inside the plurality of coils, wherein the elongated cross section of the flat cooling tube is substantially the same as, or slightly larger than, the length of the coils in an axial direction.
2. The linear motor coil assembly according to
3. The linear motor coil assembly according to
4. The linear motor coil assembly according to
5. The linear motor coil assembly according to
6. The linear motor coil assembly according to
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The present invention relates to a linear motor for generating linear movement. More particularly, the present invention relates to a linear motor coil assembly having a plurality of coils arranged in a line in the direction of linear motion.
Machine tools are known that use a linear motor to cause a table to move linearly at high speed and to position the table with high precision. Recently, linear motors have become more widely used. Such motors do not a require conveying means such as a feed screw. A linear motor may be used in a machine tool when it is needed to generate a large thrust, and where more compact structures are needed. However, because of their compact size, linear motors generate more heat than rotary motors. The temperature rise associated with a linear motor may limit its rated thrust, and lower its mechanical positioning accuracy. In many cases, linear motors are encapsulated in a cover in order to prevent magnetic dust from infiltrating into the linear motor. Because of this encapsulation, insufficient natural cooling of the linear motor may result, making effective cooling of the linear motor an important consideration.
Japanese Laid-Open Patent Application 63-18956 discloses a cooling apparatus for a linear motor. The motor is equipped with a cooling tube at the bottom of a groove formed between adjoining pole teeth. This linear motor cooling tube will now be described in detail below with reference to
An object of the present invention is to provide a linear motor coil assembly that efficiently dissipates heat generated in the coil.
Another object of the present invention is to provide a compact linear motor coil assembly.
Still another object of the present invention is to provide a simple method of manufacturing a linear motor coil assembly, having a high cooling efficiency.
These and other objects are achieved by providing, according to the present invention, a linear motor coil assembly for developing linear motion. The coil assembly comprises a plurality of coils arranged in a line in the direction of movement, respective coil shafts being arranged perpendicular to the direction of movement, and a flat cooling pipe, having a cross section that is elongated in a direction parallel to the coil shafts and having folds into which the coils can be engaged, the cooling pipe meandering inside the plurality of coils.
The flat cooling pipe preferably has a plurality of clearance holes for passing coolant formed in a direction parallel to the coil shafts.
Alternatively, the flat cooling pipe for passing coolant may be formed by aligning and attaching a plurality of round pipes in a direction parallel to the coil shafts.
The flat cooling tube preferably has interleaved folds at least equal in number to the number of coils.
The linear motor coil assembly may also include cores, divided for each coil, around which the coils are wound.
According to the present invention, there is also provided a method of manufacturing a linear motor assembly for developing linear motion, comprising the steps of providing cores divided for each magnetic pole, winding coils around the respective cores, providing a flat cooling pipe having interleaved folds, at least equal in number to the number of coils, into which the coils may be engaged, fitting the core into the folds, and arranging the cores in a line on a base plate.
Other objects and novel features will become apparent upon consideration of the following description.
A linear motor coil assembly according to an embodiment of the present invention will now be described with reference to
A linear motor coil assembly 12 for developing motion in the direction of a horizontal linear axis X has a base plate 11, cores 13 having coils 14 mounted thereon. The coil assembly 12 may constitute either a mover or a stator. Reference numeral G1 in
A method of manufacturing a coil assembly according to the present invention will now be described in detail below with reference to
As shown in the exemplary embodiment of
After lead wires of the coils 14 have been located on the outer side of the base plate, the coil assembly 12 may be covered with a box-shaped frame. The frame is filled with insulating resin until the pole faces 13a of the cores 13 are covered. The fixed resin compact may then be finished to the specified dimensions so as to expose the pole faces 13a.
The illustrated embodiment has been selected simply to describe the essence and practical application of the present invention, the scope of which is defined solely by the appended claims.
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Mar 22 2001 | SEKI, YOICHI | SODICK CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011875 | /0766 | |
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